Isekai'd Without a Clue

(Y/n) is getting annoyed with their little brother's latest obsession. All they ever hear from him now is "Naruto this" and "Naruto that." It's even gotten to the point where his words are looping in their head without actually registering.

But, when they get hit by the infamous truck-kun and are Isekai'd into the very world their brother was obsessed with, they start to wish that they had paid more attention.

Especially when they accidentally become mizukage and adopt a young boy from the low caste district.